### Explanation of Problem : Card Lottery Game

There are **’n’** (1 to 50) number of cards in a box and each of them has a number written on it. Take a card from the box and **return** it after seeing the number written on it. Continue the process for **4** times. Now you have four numbers. If the summation of those four number equals **‘m’** then you win the game. If it does not then you lose.

Input Example:

n = 3

m = 9

k = {1, 2, 4}

On the above input example the number of cards in the box is **3**. The targeted summation value after carrying on the game 4 times is **9**. The numbers written on our three cards are **1, 2, 4**.

Now if there is **at least one combination of numbers** which can give us the summation **m = 9** then,

Output Example

YES

if there is no such combination then

Output Example

NO

In the above input example if the player can pick **4 cards as 1, 2, 4, 2** then the summation will be **9** which is equal to the value of **‘m’**. So on the above input example the output will be definitely **YES**.

Now let’s have a look at an input example which will definitely give us output **NO**.

Input Example:

n = 3

m = 9

k = {1, 3, 5}

On the above input example there is no way you can pick cards from the box **4 times** and make the summation of them equals to **9**. Because it will always be **greater than 9** no matter how you pick those cards from the box. So for this input example the output will be definitely **NO**.

### Solution of Problem : Card Lottery Game

I am going to show you the solution of this problem using C Programming. Let’s have a look at our source code.

#include <stdio.h> #include <stdbool.h> const int MAX_N = 50; int main() { int n, m, k[MAX_N]; printf("n :"); scanf("%d", &n); printf("m :"); scanf("%d", &m); printf("Enter the numbers written on each card....\n"); for (int i = 0; i < n; ++i) { printf("k[%d] :", i); scanf("%d", &k[i]); } bool f = false; for (int a = 0; a < n; ++a) { for (int b = 0; b < n; ++b) { for (int c = 0; c < n; ++c) { for (int d = 0; d < n; ++d) { if (k[a] + k[b] + k + k[d] == m) { f = true; } } } } } if (f) { printf("YES\n"); } else { printf("NO\n"); } }

Let’s have a look at input output example once you run the above code in the command line.

If you have any questions feel free to ask me in the comment section.